Girls! Advice for breastplay (or second base)?

Ok, so I've been always wondering this, and I thought no better way to ask than on this website! :D so girls, during second base, or sex for that matter, what do you like guys to do to your breasts? Would you rather him play with them outside of your shirt? And what feels good? Spare no detail ;D I know I'm a perv haha I'm 19 and I have a girlfriend, I'd love to know what to do when the time comes!
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